Using massless fields for observing black hole features in the collapsed phase of Euclidean dynamical triangulations

We report on an old computation of propagators of massless scalar fields on an ensemble of configurations in the 4D path integral of Euclidean dynamical triangulations in the collapsed (crumpled) phase. The resulting quantum average is used to calculate the scale factor of a rotational invariant metric in a 4-dimensional space. This new scale factor is non-zero at the origin, which we assume to be caused by the presence of the well-known singular structure in the collapsed phase. It depends on an overall integration constant. A transformation to a metric in (1+3)-dimensions reveals Euclidean black hole features at an instant in time, with a horizon separating interior and exterior parts. Effective Einstein equations in the presence of a `geometric condensate' are assumed, and computed with the software OGRe. We find similarities with the energy density and pressure of gravastars, as well as remnants, and investigate their dependence on the integration constant.
13 pages; rearranged Introduction, added comments, added 3 references to CDT